Methods, devices and systems for measuring emotions expressed by computing emoji responses to videos are described. An example method includes receiving user input corresponding to an emoji at a selected time, assigning at least one meaning-bearing word to the emoji, wherein the at least one meaning-bearing word has an intended use or meaning that is represented by the emoji, associating a corresponding vector with the at least one meaning-bearing word, wherein the corresponding vector is a vector of a plurality of vectors in a vector space, and aggregating the plurality of vectors to generate an emoji vector that corresponds to the user sentiment.